Oncidium orchids have been nicknamed the Dancing Lady Orchids and once you see a flower, you know why. Oncidiums are a relatively small plant and may bloom in a 2.5 IN pot.
LIGHT – Fairly bright light is needed, especially during the winter months when a southern exposure would be ideal. Shading from the bright Colorado sun will be required throughout most of the year for all orchids. A sheer curtain or translucent window would be ideal.
TEMPERATURE – The majority of oncidiums will grow well with intermediate temperatures ranging from around 60 degrees F at night and 70-85 during the day. As with all plants, lower night temps are always beneficial.
WATER – Water depending on the plant’s growth. When in full growth or flowering season, water should be applied as soon as the plant begins to dry out. This is easily determined by the plant’s weight. Some oncidium rest for a time after flowering and should be watered sparingly until new growth appears. Watch your plant for signs of its needs. If the bulbs begin to shrivel, apply more water.
HUMIDITY – Around 50-60% relative humidity is ideal. Group plants together or place them on a tray filled with gravel and partially filled with water to increase humidity levels. If the humidity in your home is below 50%, both you and your plants would benefit from a rise in levels.
AIR MOVEMENT – This is helpful to all plants as long as it’s not hot, dry air. A small fan in the same room with your plants may prove to be beneficial. Remember, in nature, there is almost always a gentle breeze.
FERTILIZER – Oncidiums are not heavy feeders and foliar feeding has produced excellent results. Use a balanced 20-20-20 solution during the spring and summer months of active growth. Withhold feeding during periods of slow growth, usually during the winter months.
POTTING – Repotting is usually best done in the early spring as new growth begins to emerge. Use as small a pot as will hold the plant. Repot at least every two years. Ensure that your pot and potting medium have excellent drainage as oncidium roots do not light to stay wet.